Lockout-telephone for party-lines.



E. BOWMAN. LOOK-OUT TELEPHONE FOR PART-Y LINES.

- I APPLICATION FILED IE-B.l6, 1912. 1 071 292 Patented Aug. 26, 1913.

v 3 SHEETS-SHEET l.

WitnesseS." Invenior.

E. BOWMAN. LOSE-OUT TELEPHONE FOR PARTY LINES.

- Y APPLICATION FILED FEB.16. 1912. 1,071,292, PatentedAug. 26, 1913.

, s sums-$333132.

:L I 19 0 G v I Y J MN a v27 7 2s Z3 I X I ze W1tnesses, Inyenton E. BOWMAN. I LOOK-OUT TELEPHONE FOR PARTY LINES.

- APPLICATION FILED P313216, 1912. 1,071,292. Patented Aug126, 1913.

I 3 SHEETSSHEBT 3.-

f UNITE-D sw ms PATEnT} ELl-IANAN BOWMAN, or ntmwoon; ONTARIO, "CANADA, AssIeNoRor one-ruins CHRISTIAN ROTH MILLER, 01 BEBLIN, ONTARIO, CANADA. 1

JQGKOUT-TELEPHONEFOR PARTY-LINES.

To all whom it may concern: I 7

Be itlmOwn that I, ELHANAN BOWMAN, a subject of theKing of Great Britain, resident of the village of Elmwood, county of-Bruc, Province of Ontario, in the Domillion of Canada, have invented certain new and useful Improvements in Lockout- Telephones for PartyrLines, of which the following is a full, clear, and exact description of same. v

The invention relates to improvements in 7 lockout telephones for party lines, as 'de- Hscribed inthe following specification and illustrated in the accompanying drawings that form part of- .the same.

The invention consists essentially in the novel construction and arrangement vof parts, whereby the means for connecting withthe inain line in all the instruments on the linel may be controlled from any one instrument, a.nd whereby the polarization of I the'armature ofthe lock-out magnets is rec- I Y tifiedautomatically on the release of the receiver hook.--'- 1 v {The objects of the invention are, to insure primoyion party lines preventing a third party cutting in when the line is in use, ,;-to increese the efliciency of the instrument rendering it more. sensitive in its operation, toQeoonomizein-battei y power, to allow a third-perty to obtain connection with cen-' .trtil in; cases of emergency without inter-' ruptin'githe other partiega-nd to'devise asimple and improved mechanism which will not be liable 'to g'etout of order. i Inthedrawings, Figurel is''e diagram-z H matic view of a ,telephfone constructed in V, accordance with my invention showing the door of the-casing open end-partlybroken 4'0 away. Fig. 2 is an enlarged frent elevagtionel view of a ,portion ofthe contact making and lock-out mechanism showing,-

theposition of the parts inthe first contact position. following the release of the 're-' ceiver' hook. 31s an end elevational' view ofthe magnets, armature and operating rod shown in, Fig- 2. Fig. dis atop plan view ithe-mechanism shown in Fig. 2.

is a. front elevationalview of the oocontzict mechanism shown pi'n- Fig. 2 illus trsting the; position oii the pa-rts on-the i breaking of ethevfirst contact. Fig. 6 is a;-

front elevetionel viewof the contact mechanism the position of the parts in specification of Letters Patent. Patented Aug. 26, 1913} Application filed February 16, 1912. Serial Nd. 677,891.

' the second contactposition. iFigf'Z is a;

front elevational view of 'the'contactinechanism illustrating the position of the parts following the breaking of the second contectwhenthe line is clear. Fig. Sis "a front felevational view of the contact mechanism illustratingfihe position of the parts fol lowing the breakingof the second contz'ict when the line is in use. i

numerals-of reference indicate correslppnding parts in each ,figure. ferring to the drawings, 1 is the tele-' phone having a suitable generator magneto 2, batteries 3, condenser 4t,- induction coil 5, receiver hook-6 vand receiver .7. These severalzdevi'ces are wired and operatively connected together in a manner which will be more fully explained hereinafter; though any explanation of such apparatus will be brief as these parts are all more or less I known" and common. Certain particular featuresin the \W111Il-g-.2He, however, essen'-- tial to the present invention The receiver hook 6 is pivotally supported from the bracket 8 at its inner end and spring acmated to spring upwardly by the leaf spring. 9 connected thereto through the link .10.; Y

11 is a springnrm secured at one end to the receiver hook 6. 12 is a; rod pivotally secured to the free end oi' othe spring arm llQand extending upwardly therefrom"into ncasing 13 arranged Within. the main casing of the telephone, said arm- .beingsupportedlin a vertical position byis guide 14 rigidly supported within said casing and through c which said rod-extends andisslidable therein. The upper end of the rod 12 isjforined with an angular-lateraliofiset loiand. a perpendicularly estranged crooked portion. 16 terminating ina. straight upper portion 17.

18 is an electro-mztgnet' rigidly supported within the small causingv .13.

7- 19,is' the armature 'of the celectro inegnet 18' supported "upon a flexible springl \arm 20, said -arm being securedet its lowerend ,toecbrscket-QI within tl-iencasingm; and i said bracket having an adjusting-screw'-l22i threaded therein to adjust the position Of-f'l 1 I the: orin -20' and armature 19 in; relationto f athe-core of the said'inagnet. sa light I frame secured tothemside of the armahire L9 away from the electro;

niag'mrt 18, said frame havinga bent portion it (see particularly Fig. 4) adapted to allow the rod 12 to rise freely and also.

having the portion 25 adapted to enga-gethe outwardly curved portion of the crooked end of the rod 12. i

26 is a downwardly extending V-shaped member forming part with the frame 23 and ar anged to the forward side of the upper end of the rod 12. The portion 25 of the frame is so arranged that as. the rod 1.2 is moved upwardly andthe straight portion 17 disengages from the rounded contact 27 on the armature 19 the curved portion 16 ot the crooked end. of the rod engages a rounded contact- 28 secured to the inner side of said portion 25, thereby pulling the ing a laterally extending loop or hookshaped portion at its lower end, said hook shaped portion being adapted on the raising of the rod 12 to engage a. projecting block 35 of non-conducting material, secured to one side of the said rod and to make an electrical connection with the Contact 29. lhe spring contact 33 is electrically. connected through the wire 36 to the electron'iagnet 18 and the said electro-magnet is connected through the wires 37 and 38 to the binding post 39 leading to the other line wire.

40 is a spring contact arm arrangedadi acent to the contact 33 and extending below the same and having a crooked lower end 41 adapted to be engaged by the block 35 on the rod 12 and to make an electrical connection with the spring arm 33. The contact 40 is electrically connected through 1 the wire 42 wit-h the batteries 3 and when said contact 40 is in contact with the arm 33 an electrical connection through the magnet 18 is established through the wires 36 and- 37,, the wire 43, spring contacts 44 and 45 and wire 46 to the batteries.

It will be seen that as the rod 12 rises, a momentary connection is made through the latter circuit shunting the battery current through the electro-magnet coils. this clrcuit is closed the upper straight end '17 of the rod 12 is holding the armature in contact with the magnet core. The fiow of current through the coils of the magnet thus rectifies the polarization of the arma- When shoulder the spring arm 20 will throw the said arms ture and renders it very sensitive anl easily attracted by the magnet when energized from the outside circuit. As the rod 12 con- "tinues its upward movement the temporary electrical connection between the batteries and the magnet 18 is broken by therelcase of the spring arm 40. Following this tom porary connection with the batteries the curved portion 16 of the rod 12 engages the rounded contact 28 and through the frame 23 pulls the armature away from the magnet coils it there is any tendency for the said armature to stick but Ordinarily the I s 31in arm 20 carr i11 the. armature draws it away fromthe magnet core. Following this a temporary connection is established between the main line and the electro-magnot through the operation of the spring arm 33 engaging the contact 29 inthe manner described. loincident with the establish ing of the electrical connection between the clectro-niagnet and the main line the shoulder 47 of the crooked end of the rod 12 engages the contact 27 and moves the armature against the magnet core. In the event of the line being in use, the battery current lowing through the electro-magnet will cause the armature 19 to be held to the core while the contact between the spring contact arms 29 and 33 is maintained.

48 is a spring contact arm electrically connected to the wire 42 leading from the con tact arm 40.

49 is an electrical contact supported on the frame 23 and insulated therefrom'and electrically connected. through the wire 50 to the binding post 39, said contact bein ada ted to engage the spring contact 48 an to c ose an electric circuit from the binding post 39 through the wires 42 and 51, spring contacts 52 and 53, wire. 5-4, generator contacts 55 and wires 56and 57 to the binding post 32.

58 1s a branch rod extending laterally from the rod 12 and having an upward extension 59 pointed at the end. The pointed end is so arranged that it extends slightly apoyethe depending apex of the plate 26 secured ,to thearmature 19 just prior to the block 35 releasing the spring arm 33 from contact with the arm 29. If the line is in use, the electro-magnet 18 will be energized and hold the armature to it and the point of the rod 59 will engage the plate 26 to the side of the apex farthest from the magnet thusmechanically holdin the armature. so

that the contacts 48 an 49 cannotcome into engagement- If the line is free tho armature gill be released immediately the 4 passesover the contact 27 and cure away from the magnet allowing the point of therod 59 to engage the side of the plate 26 nearest the magnet and as the rod 12 moves to the limit of its stroke the rod 59- will foroethe armature over bringing the electrical contacts e8 and 49 into engage incnt 'lhe rod-l2 "is suppo te'd on the springarm ll so that none-of the parts "will be injured in the event of the point ofthe rod 59 coming in contact with the ape-X of the plate26. It will-be seen that the generator circuit isthusconnected with thernain line and onthe-turning of the generator cranlr'the circuit is closed- Atthe same time an electrical through the wire 42, condenser 4, wires 60 and 61, coil '5, wire 62 plates 63 andtiet, wire (35, receiver Tend wire 31 to the binding post'32. The receiver circuit is thus com pleted through .the condenser which is not a conductor of the direct battery current.

The transmitter circuit- 'is closed simul taneously with the generator circuitthrough the plate 67 and leaf spring 9 being brought into contact by the raising of the receiver hook, one branch beingthrough the Wire 68,

coil 5 and wire 69 to the transmitter 70and the other branch being through the wires 66 and 42 to and through the batteries to the xvi -e 71. /Vhen a'connection to another instrument has been obtained and it is desired to lock-out a third party a button 72 is brought ,intooperation. This-button 72 is arrimgedon the end of a rod 73 secured to a spring contact plate 74, said spring contact plate being connected with the battery throughthe wire75.

76 is a spring contact plate arranged close to the plate 74 and adapted to be electrically connected therewith on the button 72 being the wires 75 and coil 5 the Wire 62 leads to the plate 63 andv the current flows through the plate 64, wire I through the wires 42 to. the batteries;

pressed inward.

77 is a wire connecting the plate 76'with: I the coil 5.

Y '78 is a spring latch projecting-from the inner end of the receiver arm 6 and is adapted, when the receiver is 0 11?, to engage thecontact 7% when the button 72 is pressed inwardly. The latch thus holds the plates Tl and 76 in electrical contact thereby closing the circuit from the batteries through l 1 L0 the coil 5.

(3:3,and receiver circuit to the post'32. The return circuit from the post 39 leads through the wire 50 to the contacts l9 and 48 and This connection is immediately broken'on the replacing of the receiver.

79 1s a spring contact arranged adjacent to the spring contact 53 and awire 80 leads therefrom to the binding post 81 which is soo grounded. 1

S2 is a push button arranged in the side of the instrument andengagi-ng the spring contact 53 and adapted on being pressed in: wardlv to establish an electrical connection between the vplates 53 and'79 tl'l6i;:i EOE- meeting the generator circuit to the ground connection "is made From the wire so that an emergenoycall to'centralcan be made in the event of the instrument being looked cut-from the main line;

' 83 and 84: are -wires electrically connectedto the binding posts 32 and 39and cohncc'e ing the-ringer 85 to the main line' V In the operation of this instrument, a. per son desiring touse the same operates the generator which is connected to the main hook and the said hook beingspri-ng actuated to rise, moves thelrod l2npwardly. The block 35 on the rod 1-2 first engages the crook .of the spring arm 40, pressingsaid arm into electrical contact with the arm 33 thereby closing the local battery circuit through the electro-magnet 18 in the manner described, the upper end of the rod simultaneously engaging the armature 19 and moving it into contact with themagnet core. The polarization of the magnet core is thus corrected and themagnet coils rendered-more sensitive. As the rod .12 moves upwardly.

the armature is-drawn away from the-magnet by the crook l6 and the block 35 dieengages from the crooked contact 40; -;The further movement of the rod brings the shoulder 47 of the said rod into engagement with the armature l9 returning it into contact with the magnet core and the block 35 presses against the crookede id of the spring contact 33 to make an electrical connection with the contact 29. The electro-magnet is thus connected to the'main line as herein,

before described and it the line is in use, the 1 battery current from thefother instruments flows through thetel'ectro-magnet; l8 1 and holds the armature until the point of the branch rod 59 engages thd plate 26, the rod holding said armature in the mannerdescribed. "If the line isfree the springQO will move the armatureaway from the electro' lnagnet and the branch rod 59 will connect' the several circuits to the main-linens described. When the main line connection has been obtained and the desired party obtained, the battery circuit may be connected pressing in the-button 72, therbyen- "ergizlng the-line so that all. other" instruineuts on the line wil llbe efiectually locked outby the operation of the apparatus described. Anemergenoy call may. however be made at any time by operating the button 82 obtaining aground circuit connection --with central.

A veryimportant feature in this inven tion is that by the peculiar arrangement of wiring with the spring-oo'ntacts-63 and 64:

and insure privacy.

and the condenser and the contacts 44 and 45, several electrical connections aremade "with a single set of batteries utilized simultaneously in two separate circuits, that is to say, the batteries are utilized in the transmitter circuit and also connected with the main line by means of the button 72 and c0ntacts 74 and 76 to lock out other telephones If. the person using not desire to lock out the other instruments on the line the button 72 is not operated.

' Thetransmitter circuit, constituting wire 71,

batteries 3, wires 42 and 66, contacts 67 and 9, wire 68, coil 5, and wire 69, is connected to the receiver circuit of the other instrument'through the wire 42, contacts as and 49 and wire 50 connected to one line wire and enters the other instrument on the wire 31 completing the'circuit through the wire 65, contacts 64 and 63, wires 62 and 61, condenser4, wire 42 and succeeding connections back to the first instrument. The electrical connection is thus established but as the current over the line.

.the line battery current will not pass through the condenser there will be no flow of battery Inthe event of the button 72 being pushed in, the battery current will flow through the wire 77, contacts 76 and 74; and wires 75, 71, 69, 68, contacts 9 and 67 and wire 66 to wire {12 thus bridging the condenser and allowingthe flow of the battery c'urren'tover the main line so to central maybe made through the ground v pressed in makes a connection to the, ground connection by a locked out party and cen tral may thencut in on the line and if nec- 'essary release the third partys phone by connecting a counteracting battery current on to the main circuit toneutralize the magnets '18 and allow the third party to get c onnection with the main linflfand ring up the party desired. An additional connection is also provided in a button 86 connected by a.

wire 87 to the wire 42. This button on being through the contact 79, wire 80 and post 81 and enables subscribers using the instru-' ment in the event of the line wires being brid ed or one of them being broken.

at I claim as my invention is I 1. In a lockout telephone for party lines, the combination with the main line wires, of an electro-magnet, a local battery circuit,

the instrument does r a transmitter circuit, a receiver circuit, an armature for. said electro-magnet carrying an electric contactadapted to close the receiver and transmitter circuitls to the main line, a receiver hook, and means operated-by the receiver hook adapted to first momentarily close the local battery circuit through said electrofmagnet to polarize'the armature, then momentarily connect the electromagnet-to the main line circuit and finally to move said armature to close the transmitter and receivercircuits to the main line or hold said armature to maintain an open receiver circuit. v

2. In a lockout telephone for party lines, the combination with the mainline wires, of an electro-magnet, an armature support-- ing a movable electric contact which is electrically connected to one of the main line Wires and is adapted to close the transmitter and receiver circuit to the main line, a local battery, a recelver hook, means operated by said receiver hook adapted to first electrically connect said electro-magnet with said local battery momentarily coincidently moving said armature into engagement withthe magnet core, then breaking said connection with the local battery and momentarily connecting said magnet with the main line and finally moving the armature and contact carried thereby to close connection with the main line or to retain an open circuit.

3. In a lockout-telephone for party lines% the combination with the main line wires, 0 an electro-magnet, a local battery circuit, a transmitter circuit, a receiver circuit, an armature for said electro-magnet carrying an electric contact adapted to close the receiver and transmitter circuits to the main line, a receiver hook, means operated by the receiver hook adapted to first momentarily close the local battery circuit through said electro-magnet to polarize -the armature, then momentarily connect the electro magnet to the main line circuit and finally to move said armature to close the.. 'an sm1tter and receiver circuits to the main: lineor hold said armature to maintain an-, open receiver circuit, and means for electrically connecting the local battery circuit on to the main line to energize the electro-ma'gnets in the other instruments on said main line.. z N

4. In a lookout telephone tor-party lines. the combination with, the mainline wires, of an electro-magnet electricallyconnected with .one of said main line wires, a local battery,

a movable contact electrically connected withsaid battery, a movablecontact electri- Y .cally connected with-said magnet and adapted to be engaged by the first movable con-j 'ta'ct to close the battery circuit through said magnet, a' stationary electric contact elect-ricajlly connected to the return main line wire and adapted to be engaged by the second 'm'ovable electric contact to close the. main g circuit through the magnets and to' line circuit through said. elect-ro-magnet,

transmitter and receiver; circ'i-iits, an a'rma--' ture arranged adjacent to said 'electro-ma g' netga. stationary contact adapted to be elec'-.-

trically 'c'onnectedto' said transmitter and receiver circuits, an electric contact carried on said armatureand electrically connected with 'one'of the mainline wires and adapted to engage the stationary contact electrically connected to one of saidtransmitter and re;

ceiver circuits, a" recei-Ver hook, and "means operatively connected to said receiver hook adapted'to first bring the first two movable contacts together momentarily to close the simultaneously move the armature int-o contact-w'vith the magnet core to polarize the same, then to 'br'eak thefcontact 'of saidmovable contactshnd move the armature away from the magnet core, thento'rnove the sec- 0nd movable contact-to'engage the station ary contact connected with-the main line closing the magnet-circuit onto the'maiii line, and simultaneously moving the armature lIltO engagement W1th the magnet core,

' then breaking the electric contact between ated by said-receiver hook adapted to momentarily close the local "battery circuit to said movable and stationary contacts, and

finally engaging the armature to 'hold itin contact with saidlmagnet core or to" mov it so as to bring the electric contact carr ed thereby into engagement with the stationary contactconnected to the transmitter and receiver circuits vto close said circuits to the main line." d i Y 5. In .a lockout telephone 1 for party lines,- the combination With the main" line Wires,

of a local battery circuit, transmitterand receiver circuits, an electro-magnet, an arma; ture carrying an electriccontact adapted to close the transmitter and receiver circuitsto the main line, a' V-shaped guide carried by said armature, a receiver hook, means'oper the magnet then to the main line, and a member connected to; said recei'verhook adapted to extend toeither side of the apex of said guide to hold theflcontact member carriedby said armature positively in or out of contact with the main line. i z

6. In a lookout telephone forparty lines. the combination with themain line wires, of a generator circuit having r one. lead connected -with ..one o n airig'line wires, a, stationaryclectrl to the other lea one lead connected. to

nec ed W thone ofsaidma ml and-adapted to (mgagesaid stationary. con tact to connect theggeneratorand b when said hook hook is depressed.

battery ciriiit hating j u one ofs aid main lines and the other lead; connected to said station; arycontact, an electro magnet, an armature for said OlQClZI'O IYHLQ'DEt, an electric Contact riele yfl' d"a mat e ewi-e e i i illy \V1.I.QS,.

carried by said receiver hook for controlling the movemcnto'f said armature and the con tact carried thereby to close the circuits to the main line or to positivcly preventthe "connect on to the' main line, a circuit breaking devicearrangediin said battery circuit,-

a push button adapted to closeslaid' circuit breaker, and means carried by said receiver hook for holding said'circuit breaker closed is raised and the instrumentisinuse. i

'7. YIIY'ZL lockout telephone forpz'rrty lines, thecoinbination With the'main line wires, of

'an electro-magnet, a local'battery circuit, a I

transmittercircuit, a receiver circuit, an ar'- mature for said elec'tro-magnet carrying an electric contact adapted to close the receiver"; and transmitter circuits tothemain 1ine,"a

receiver hook, means operated by the receiver hook adaiited to first momentarily close'th'e local 'battery circuit through'said- .togeth'er tothrow the battery current on the main li'r' e, and'a springhook carried bysaid receiver hook adapted to engage. and hold said cont-acts together following theorieration'of thepush button of the re'ceiver hook if first' raised said spring hook'being adabted to release'saidicontac'ts when th'e receiver x 8. In a lookout telephone for party lines, the combination with the main line wires, 1

of a local battery circuit in the instrument,

a generator circuit adapted to be connected with said main lines, an electro-magnet ar-l ranged in said local ba-tterycircuit, an armature movably supported adja'cenvto said electromagnet, means controlled by the 'movement of said armature jfoi' openingor closing said generator "circuit, a receiveni15 hook, means operated by'said receiver hook I for moring sa d armature, and a'pluralitv ofspring'contact members adapted tobe operated successively by thefmoveiirlent of sagidiir'eceiver hook to momentarily close the ttelphohe 1.1 with the "main line wires,

for party lines, I

supported adjacent to said electro-magnet, means controlled by the movement of said armature for opening or closing said generator circuit, a pair of spring contact arms arranged in said local battery circuit and normally held apart, a receiver hook, and

means operated by the movement of said receiverhook for moving said armature into contact with the core of said magnet, and

means operated by said receiver hook for .moving said spring arms into contact to close the local battery circuit momentarily to energize said magnet and polarize said armature.

10. i In a lockout telephone for party lines, the combination with the main line wires,

1 of a generator circuit, a receiver circuit, and

ture, an electrical contact carried on said frame and adapted to engage said common contact member to close the circuits leading thereto with the main line, a receiver hook, a rod operatively connected to said receiver hook and slidably held mid-way of its length, said. rod having a crooked upper end adapted" to extend through said guide frame, the extreme upper end of said crook being adapted to engage the armature and move it into contact with the magnet core on the initial upward movement, the center portion of said crook being adapted to engage the guide frame and draw the armaturc away from the magnet and the lower end of said crook being adapted to engage ;the armature and return it to engage the magnet, each portion acting successively, a

projection secured tosaid rod intermediate of its length and adapted to engage the lowcrmost crooked spring contact arm to bring it into electrical contact with the other crooked arm to close the local battery circuit through the magnet at the period when the armature i's first moved into contact with the core, said projection being adapted .to

release the first crooked spring arm and as the rod moves upwardly engaging the sec-' ond crooked arm moving it into electrical contact. with the contact connected to the branch from the receiver circuit and closing the receiver circuit through the magnet following the withdrawal of the armature and concurrent with the return movement thereof caused by the engagement of the lower part of the crooked end of said rod, and means carried by said rod adapted to engage a portion of said frame before the second crooked springcontact is released and to hold said armed and frame positively so that the electric contact carried by said frame is either in or out ofcontact with the electric .contact common to the several outside circuits. v. r

11. In a lockout telephone for part-y lines, the combination with the main line wires, of a receiver having one lead directly connected to one of said. main wires, a spring'contact connected to the other lead from said receiver, a spring contact adapted to co-act with the aforesaid'contacha receiver hook operatively connected to more said contacts into engagement, a condenser electrically connected to the latter spring contact, a contact electrically connected to said wndenscr, means actuated by said receiver hook for electrically connecting the latter contact with the other mainline, a transmitter, a

battery circuit connected with said t-ransmitter,-and means operated by said receiver hook for connecting said transmitter circuit with the receiver circuits in the other instruments on the line.

12; In a lockout telephone for party lines,

the combination with the main line wires,

ofa receiver, a condenser wircd to said receiver, a receiver hook, means operated by said receiver. hook for closing the receiver circuit through said main lines, a transmitter,'a battery circuit connected to said transmitter, means arranged in said transmitter circuit and operated by said receiver hook adapted to electrically connect said transmitter circuit with the main line concurrently with the closing of the receiver circuit, and means for connecting said battery circuit direct to the main line.

13. In a telephone, the combination with the main line wires and receiver and transmitter circuits, of a ground connection, a contact connected to said ground. connection and a push button electrically connected with the receiver and transmitter circuits and adapted to engage said contact to close a connection through the ground to complete a circuit in' the event of one of the main line wiresbeing broken or said main wires being bridged. 1

14. In a lookout telephone for party lines, in combination, a pair of main line wires, a. generator circuit, a receiver hook, means controlledby the movement of the receiver hook for c' o'nnecting the generator circuitto the main'lines, a receiver having one terminal connected to one main line, a spring contact electrically connected to'the other receiver terminal, a spring contact actuated by the upward movement of the receiver hook to "close contact with the other spring contact, an induction coil and a condenser wired to the latter contact, means actuated by the receiver hook adapted to close the receiver circuit to the other main line, a bat tery a transmitter, a pair of electrical contacts operated by the receiver hook, Wiredv to said transmitter and said battery and. closed on the raising of the receiver hock, an electromagnet, an armature for said magnet controlling the connection of the transmitter and receiver circuits with the main line, an electric circuit through said electro-magnet connected to the local ham teries, a pair of electric contacts arranged in the battery circuit to said magnet and tiormelly held" closed While the receiver hook is down, and a, pair of electrical contacts in said local battery circuit actuated by the first initial mcvefnent' of the receiver hook to close the said circuit momentarily. 7

Signed at the town of Chesley this twenty 20 fifth day of January 1912.

ELHAE AN BCWVMAN.

Witnesses:

JOHN URSTADT, MICHAEL HAUG.

Qepies e? this pattern: may he obtained for five cents each, by addressing the Sommissioner of Patents, Washington, 20$. 

